"This manual presents the principles which govern the employment of troops during civil disturbances in the United States, in territories and possessions of the United States, in countries where United States troops are stationed by agreement or consent, and in areas occupied as a consequence of belligerent action. The manual presents the essential substance of the more important laws relating to the employment of military forces in aid of civil authorities and applicable Department of the Army policies. The general principles and methods of employment of troops and materiel apply equally to any armed forces used in civil disturbances." Digitized by AHEC (U.S. Army Heritage Collections) http://www.carlisle.army.mil/ahec/
"Supersedes FM 19-15, 30 July 1945, including C 1, 22 January 1946."